TS-430S 500KHz Hetrodyne

Author: Trio-Kenwood Communication, inc.

 Some users of the TS-430S have reported a hetrodyne signal at the 500KHz point on the band. This tone may be reduced or eliminated by the following procedure.

Parts required

Qty       Description               Kenwood parts number
 1        .001 µF disc cap.         CC45B1H102K
 1        220 pF disc cap.          CC45SL1H221J
 1        470 µH coil               L40-4711-13

Procedure

1. Remove top and bottom covers.
2. Turn radio bottom up and locate PLL unit (X50-1910-00).
3. Remove the sex (6) screws securing the PLL unit to the chassises and fold the unit over, to allow access to the foil side of the circuit board.
4. Remove the jumper wire that is installed between TP-1 and C6. Install the parallel circuit consisting of the 220 pF capacitor and the 470 µH coil in its place. See figure 2.
5. Install the .001 µF capacitor as shown in figure 2.
6. Reinstall the PLL unit and replace the top and bottom covers.
7. No alignment is required.

Note: This change may be performed at the owners option and may not be performed in-warranty.

Attachment

» Download: ASB0865.jpg (243 Kb)

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Page last updated on 12/29/2011 by Kevin Roberts W1NGL a colection of Ham Radio and Electronic Information